SYMBFACT

 

 Symbolic factorization analysis.

 

 

  count = SYMBFACT(A) returns the vector of row counts for the upper

  triangular Cholesky factor of a symmetric matrix whose upper triangle 

  is that of A, assuming no cancellation during the factorization.  

  This routine should be much faster than chol(A).

 

 

  count = SYMBFACT(A,'col') analyzes A'*A (without forming it explicitly).

  count = SYMBFACT(A,'sym') is the same as p = symbfact(A).

 

 

  There are several optional return values:

 

 

  [count,h,parent,post,R] = symbfact(...) also returns

       the height of the elimination tree,

       the elimination tree itself,

       a postordering permutation of the elimination tree,

       and a 0-1 matrix R whose structure is that of chol(A).

 

 

  See also CHOL2E9HJXR, ETREE4VHSWQ, TREELAYOUT3HP6LU.